Patterson Viaduct, Railway bridge in Howard County and Baltimore County, Maryland, US
The Patterson Viaduct spans across the Patapsco River with four stone arches, measuring 360 feet in length and 43 feet above its foundations.
Built between May and December 1829, the viaduct formed part of the Baltimore and Ohio Railroad's Old Main Line, marking early railway development in America.
Named after William Patterson, a B&O Railroad director, the structure reflects the engineering methods and materials used in early American transportation infrastructure.
The remaining arch and abutments support a modern footbridge that connects to the Grist Mill Trail, allowing pedestrians to cross the Patapsco River.
After the 1868 flood destroyed the original structure, engineer Wendel Bollman incorporated the surviving arch into a new single-span truss bridge design.
Location: Howard County
Location: Baltimore County
Official opening: December 1829
Made from material: stone
GPS coordinates: 39.24890,-76.76470
Latest update: March 5, 2025 20:13
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